JBL Flip 7

The toughest speaker you can still slide into a water bottle pocket. The Flip 7 steps up to IP68, rated for about 1.5 meters of fresh water for 30 minutes, and JBL rates it to survive a 1-meter drop onto concrete, which is about as unforgiving as a boat ramp gets. At about 1.2 pounds it is a clear step up in volume and bass from the pocket models without becoming a bag of its own. Rated battery is 14 hours, or 16 with Playtime Boost, though that mode trades some bass for runtime. Auracast lets it join other recent JBL speakers when a group trip brings several.